implemented Commits::deleteApproval (API 2.0)

Author: vimishor

docs/repositories/commits.md

@@ -31,6 +31,11 @@ $commits->get($account_name, $repo_slug, $commitSHA1);
 $commits->approve($account_name, $repo_slug, $commitSHA1);
 ```
 
+### Delete a commit approval: (API 2.0)
+```php
+$commits->deleteApproval($account_name, $repo_slug, $commitSHA1);
+```
+
 ----
 
 #### Related:

lib/Bitbucket/API/Repositories/Commits.php

@@ -74,4 +74,22 @@ public function approve($account, $repo, $revision)
             sprintf('repositories/%s/%s/commit/%s/approve', $account, $repo, $revision)
         );
     }
+
+    /**
+     * Delete a commit approval
+     *
+     * NOTE: On success returns `HTTP/1.1 204 NO CONTENT`
+     *
+     * @access public
+     * @param  string           $account  The team or individual account owning the repository.
+     * @param  string           $repo     The repository identifier.
+     * @param  string           $revision A SHA1 value for the commit.
+     * @return MessageInterface
+     */
+    public function deleteApproval($account, $repo, $revision)
+    {
+        return $this->getClient()->setApiVersion('2.0')->delete(
+            sprintf('repositories/%s/%s/commit/%s/approve', $account, $repo, $revision)
+        );
+    }
 }

test/Bitbucket/Tests/API/Repositories/CommitsTest.php

@@ -75,4 +75,19 @@ public function testApproveACommit()
 
         $commit->approve('gentle', 'eof', 'SHA1');
     }
+
+    public function testDeleteCommitApproval()
+    {
+        $endpoint       = 'repositories/gentle/eof/commit/SHA1/approve';
+
+        $client = $this->getHttpClientMock();
+        $client->expects($this->once())
+            ->method('delete')
+            ->with($endpoint);
+
+        /** @var \Bitbucket\API\Repositories\Commits $commit */
+        $commit   = $this->getClassMock('Bitbucket\API\Repositories\Commits', $client);
+
+        $commit->deleteApproval('gentle', 'eof', 'SHA1');
+    }
 }